import { HashMap } from './hashmap.js';
import { AbstractSet } from './abstract-set.js';
import * as mutable from './mutable/hashset.js';
export declare class HashSet<T> extends AbstractSet<T, HashSet<T>> {
    protected constructor(items: Set<T>);
    static empty: HashSet<any>;
    static of<T>(...items: T[]): HashSet<T>;
    static from<T>(elements: Iterable<T>): HashSet<T>;
    protected fromArray(array: T[]): HashSet<T>;
    toMap<K, V>(mapper: (item: T) => [K, V]): HashMap<K, V>;
    map<B>(f: (item: T) => B): HashSet<B>;
    flatMap<B>(f: (item: T) => HashSet<B>): HashSet<B>;
    concat(that: Iterable<T>): HashSet<T>;
    union(other: Iterable<T>): HashSet<T>;
    appended(item: T): HashSet<T>;
    appendedAll(other: Iterable<T>): HashSet<T>;
    removed(item: T): HashSet<T>;
    removedAll(other: Iterable<T>): HashSet<T>;
    intersect(other: HashSet<T>): HashSet<T>;
    get toMutable(): mutable.HashSet<T>;
}